Genetic Variant IFFO2:p.Arg311Gln (chr1-18918393-C-T) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP3

The NM_001136265.2(IFFO2):c.932G>A(p.Arg311Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000116 in 1,552,638 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000071 ( 0 hom. )

Consequence

IFFO2
NM_001136265.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.50

Variant links:

Genes affected

IFFO2 (HGNC:27006): (intermediate filament family orphan 2) Predicted to be located in intermediate filament. [provided by Alliance of Genome Resources, Apr 2022]

IFFO2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.774

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IFFO2	NM_001136265.2 link	c.932G>A	p.Arg311Gln	missense_variant	Exon 4 of 9	ENST00000455833.7	NP_001129737.1	Q5TF58
IFFO2	XM_011540630.3 link	c.822+1285G>A		intron_variant	Intron 3 of 7		XP_011538932.1
IFFO2	XM_047444839.1 link	c.727-1351G>A		intron_variant	Intron 2 of 6		XP_047300795.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IFFO2	ENST00000455833.7 link	c.932G>A	p.Arg311Gln	missense_variant	Exon 4 of 9	5	NM_001136265.2	ENSP00000387941.2		Q5TF58
IFFO2	ENST00000416166.1 link	c.186+1285G>A		intron_variant	Intron 3 of 7	3		ENSP00000394655.1		H0Y4W3

Frequencies

GnomAD3 genomes

AF:

0.0000526

AC:

AN:

152144

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000187

AC:

AN:

160002

Hom.:

AF XY:

0.0000118

AC XY:

AN XY:

84416

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000805

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000876

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000714

AC:

AN:

1400494

Hom.:

Cov.:

AF XY:

0.00000579

AC XY:

AN XY:

690878

show subpopulations

Gnomad4 AFR exome

AF:

0.0000316

Gnomad4 AMR exome

AF:

0.000140

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000559

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

9.26e-7

Gnomad4 OTH exome

AF:

0.0000172

GnomAD4 genome

AF:

0.0000526

AC:

AN:

152144

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74328

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.000262

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000108

Hom.:

Bravo

AF:

0.0000416

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Feb 26, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.932G>A (p.R311Q) alteration is located in exon 4 (coding exon 4) of the IFFO2 gene. This alteration results from a G to A substitution at nucleotide position 932, causing the arginine (R) at amino acid position 311 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.92

BayesDel_addAF

Uncertain

0.12

BayesDel_noAF

Pathogenic

0.14

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.049

Eigen

Pathogenic

0.80

Eigen_PC

Pathogenic

0.79

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Pathogenic

1.0

M_CAP

Uncertain

0.14

MetaRNN

Pathogenic

0.77

MetaSVM

Uncertain

0.60

MutationAssessor

Uncertain

2.2

PrimateAI

Pathogenic

0.86

PROVEAN

Benign

-1.9

REVEL

Pathogenic

0.76

Sift

Benign

0.084

Sift4G

Uncertain

0.057

Polyphen

1.0

Vest4

0.80

MutPred

0.53

Loss of phosphorylation at S313 (P = 0.0738);

MVP

0.94

MPC

2.2

ClinPred

0.76

GERP RS

5.3

Varity_R

0.43

gMVP

0.92

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over